3x+2y =12 xy= 6 then what is 27x3+8y3
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(3x+2y)3=27x3+8y3+18xy(3x+2y)
1728=27x3+8y3+(18×6×12)
1728=27x3+8y3+1296
27x3+8y3=1728-1296
=432
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